Which factor primarily causes orographic rainfall?

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1. **Orographic rainfall** happens when moist air meets a mountain.
2. The air is **forced to rise** over the barrier. As it rises it cools.
3. Cooling makes water vapour condense into clouds and then **rain**.
4. Other choices cause rain in different ways, but the main cause here is air rising over mountains.

FINAL_ANSWER: b

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